Ｑ40.What is disgust?

Ａ.Disgust is an attitude towards unclean things.<br>
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　　The second basic emotion is disgust.<br>
　　There are things which animals have to approach or have to avoid as they live. The things that they have to approach are food, the opposite sex, fellow group members, and a safe environment. Animals which approach them survive, animals which leave them die. Therefore the emotion which causes animals to approach things was developed by natural selection. This is the first basic emotion, the feeling we call interest.<br>
　　On the other hand, it is dangerous, for example, to approach a dangerous polluted environment or poison. Animals which approach these things die, animals which avoid them survive. The emotion which causes animals to avoid these things was developed by natural selection. We call this emotion disgust. Disgust is the opposite emotion of interest, it is the emotion to leave these kinds of things.<br>
　　Disgust has a special facial expression. We lower our eyebrows, frown, wrinkle our nose, and our mouth stretches vertically. When we display disgust explicitly, we stick out our tongue, which is the pose of vomiting. All of these are refusal signals derived from the actions of vomiting rotten food.<br>
　　These behaviors of disgust occur in response to bad food, a person that one dislikes, and unclean things. The value of disgust in evolution is to avoid unclean things and preserve cleanliness.<br>
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